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The Journal of Heredity 1998:89(3)
© 1998 The American Genetic Association 89:206-210

Segregation distortion at isozyme locus Lap-1 in Schlumbergera (Cactaceae) is caused by linkage with the gametophytic self-incompatibility (S) locus

MC O'Leary, and TH Boyle

Department of Plant and Soil Sciences, French Hall, University of Massachusetts, Amherst, MA 01003, USA

The inheritance of leucine aminopeptidase (LAP), phosphoglucomutase (PGM), and shikimate dehydrogenase (SKD) isozymes was studied in Schlumbergera truncata and S. x buckleyi (Cactaceae). Isozymes were extracted from phylloclades and separated using polyacrylamide-gel electrophoresis. F1, F2, and BC, populations were examined to determine the mode of inheritance. Relatively few families exhibited disturbed segregation ratios at Pgm-1 or Skd-1. In contrast, segregation ratios at Lap-1 were distorted in 14 of the 22 families that were examined. Disturbed segregation at Lap-1 was attributed to linkage with the gametophytic self-incompatibility (S) locus (recombination frequency = 7% ± 1%). Lap-1, Pgm-1, and Skd-1 assorted independently of each other. Lap-1 and S may be useful for assessing linkage conservation among self-incompatible taxa in the Cactaceae.


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